.my_frame {
    height: 100%;
    width: 100%;
}

.layui-body.login-form {
    position: absolute;
    left:40%;
    right: 30%;
    top:35%;
    z-index: 998;
    width: auto;
    overflow: hidden;
    overflow-y: auto;
    box-sizing: border-box
}

.layui-footer.login-footer {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    height: 44px;
    line-height: 44px;
    padding: 0 15px;
    background-color: #eee
}